Apparently some investmant bankers think so


Not exactly a proprietary model...
Bloomberg reports:
Quote:
Groupon Inc. has held talks with banks about an initial public offering that would value the online-coupon company at as much as $25 billion, according to two people with knowledge of the discussions.
The two-year-old startup?s IPO may happen this year and is unlikely to assign Groupon a valuation of less than $15 billion, according to the people, Bloomberg Businessweek reports in its March 21 edition. They asked not to be identified because the talks were private.
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http://www.bloomberg.com/news/2011-0...5-billion.html